Evaluation of Bronze Alloys for use as Wear Ring Material in Liquid Oxygen Pump

Modal characteristics and fluid–structure interaction vibration response of submerged impeller

Journal of Vibration and Control ◽

10.1177/10775463211003695 ◽

2021 ◽

pp. 107754632110036

Author(s):

Shihui Huo ◽

Hong Huang ◽

Daoqiong Huang ◽

Zhanyi Liu ◽

Hui Chen

Keyword(s):

Flow Field ◽

Unsteady Flow ◽

Damping Ratio ◽

Pure Water ◽

Vibration Response ◽

Modal Identification ◽

Liquid Oxygen ◽

Modal Characteristics ◽

Oxygen Pump ◽

Turbo Pump

Turbo pump is one of the elements with the most complex flow of liquid rocket engine, and as an important component of turbo pump, an impeller is the weak point affecting its reliability. In this study, a noncontact modal characteristic identification technique was proposed for the liquid oxygen pump impeller. Modal characteristics of the impeller under three different submerged media, air, pure water, and brine with same density as liquid oxygen, were tested based on the noncontact modal identification technology. Submersion state directly affects the modal frequencies and damping ratio. The transient vibration response characteristics of the impeller excited by the unsteady flow field was achieved combining with unsteady flow field analysis and transient dynamic analysis in the whole flow passage of the liquid oxygen pump. Vibration responses at different positions of the impeller show 10X and 20X frequencies, and the amplitude at the root of short blade is significant, which needs to be paid more attention in structural design and fatigue evaluation.

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A Helium Face Seal Application In a Liquid Oxygen Pump

Journal of Lubrication Technology ◽

10.1115/1.3555024 ◽

1969 ◽

Vol 91 (4) ◽

pp. 668-674

Author(s):

Walter J. Cieslik

Keyword(s):

Electric Motor ◽

Space Vehicle ◽

Vibration Damping ◽

The Other ◽

Liquid Oxygen ◽

Development Effort ◽

Face Seal ◽

Shaft Seal ◽

Oxygen Pump ◽

Helium Gas

The object of the work discussed in this paper was to develop a reliable helium gas shaft seal for use in an electric motor-driven, liquid oxygen pump on a space vehicle. The development effort covered tests on two basically different face seal designs, one with an attached carbon face and the other with a floating lap-fitted carbon face. Several bellows vibration damping devices and various seal material combinations were investigated.

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